When I got home from the swap a couple weeks ago I was not happy to find one of my clams had kicked the bucket. Before I left I had noticed that my yellow tang had nipped at its mantle, but I thought it odd that it keeled over so quickly. A week later I killed a polyclad flatworm on an LPS frag, didn't know until just now that they prey on clams. Thought I'd let everyone know (I am pretty sure this includes bigblue and lee) to check their clams at night and make sure none made their way into your tanks. It was probably just one that took out my clam. All the others were doing great up to the swap so I doubt that there are any problems.